EDM SYSCREW AIR EVO HSE

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SYSCREW 380-1260 AIR EVO HSE
49
Hydraulic options overview
Mode Fixed Speed
Variable Speed
COMMISSIONING ∆P LOGIC ∆T LOGIC AUTO FLOW CONTROL
FEATURES
Constant
waterow
Constantwaterow
Variablewaterow
accordingto∆P
USER
(*)
Variable water
owaccordingto
∆T
WATER
(*)
&∆P
AVAILABLE
(*)
(Available Static
Head)
Variablewaterow
accordingto∆P
AVAIL-
ABLE
(*)
(Available
Static Head)
BENEFITS
-
Higherefciency
thansolution:Fixed
speed pump + regu-
lation valve
Pump energy sav-
ings as the user side
2-way valves close
due to reduction in
cooling load
Pump energy sav-
ings as the user side
3-way valves reduce
thewaterowto
water terminals due
to reduction in cool-
ing load
Waterowoptimiza-
tion logic for energy
saving (according to
the operative mode)
Compliant
Erp 2018
(5)
Compliant Erp 2021
(5)
SUGGESTED
APPLICATIONS
-
Plants designed with
xedwaterow
(limitedwaterow
regulations)
Plants designed with
water terminals fre-
quently open/close
with 2-way valve
Plants designed with
water terminals fre-
quently open/close
with 3-way valve
- Plants designed
with water ter-
minals frequently
open/close with
3-way valve
- Start-Ups and
working conditions
when water tem-
perature is distant
from set point
PARAMETERS
TO BE SET
(1)
a) Pump Frequency
Set Manually
✓
b)∆T
WATER
(*)
✓
c)∆P
USER
(*)
✓
d)∆P
AVAILABLE
(*)
✓ ✓
UNITSAFETY
a) No dedicated
safety features
included
✓ ✓
b)∆P
EVAPORATOR
control on unit heat
exchanger
(2)
✓ ✓ ✓
PLANT
DEVICESON
USERSIDE
a) By-pass
modulating valve
(BMV) could be
suggested
(3)
✓ ✓ ✓
b) Differen-
tial pressure
transducer (DPT)
mandatory
(4)
✓
c)Waterow
switch recom-
mended
✓ ✓
SPECIAL
EXECUTIONS
a) Application
for Multi-Chiller
Systems
✓ ✓ Available on Request Available on Request Available on Request
(1) Parameters set via unit PLC
(2) A differential pressure transducer is installed as standard on the unit heat exchanger to ensure a minimum value of water pressure drops (corresponding to a minimum value of
waterow)thatavoidsriskoffreezingtheevaporator,eveninconditionsstronglypartloaded
(3)IncasethePlantWaterFlowislowerthantheminimunitwaterow/minimumpumpwaterow
(4)Suppliedloose,tobeinstalledoneld
(5) Erp 2018 (FW/VO); Erp 2021 (VW/VO)
(*)Denitionofparameterstobeset:
 ∆P
USER
(see Figure 2) = Minimum water pressure drop guaranteed across the installation point on user plant
 ∆T
WATER
= Difference between chiller inlet water temperature and outlet water temperature (see Figure 3)
 ∆P
AVAILABLE
= Available Static Head for user side (see Figure 4) / Pump static pressure reduced by overall chiller hydraulics pressure drops (evaporator and hydraulic circuit)